Tool-relief for metal-planers.



No. 713,614. r Patented Nov. l8, I902.

A. L. DE LEEUW'.

TOOL RELIEF FOE- METAL PLANERS.

(Application filed Feb. 13, 1902.) (No Model.) 2 Sheets-Sheet l.

'ness gs: Inventor 5 S w/ M 3. MM

- Attorney Patented Nov.. l8, I902. A. L. DE LEEUW.

TOOL RELIEF FDR METAL PLANERS.

(Apylication filed Feb. 13, 1902.)

2 Sheets-Sheet 2.

(No Model.)

j i v Lmggrlil n Witnesses: Inventor I 1 \n w. Sr; W1, 6. MM AttorneyUNITED STATES ATENT OFFICE.

ADOLPH L. DE LEEUW, OF HAMILTON, OHIO, ASSIGNOR TO THE NILES TOOL \VORKSCOMPANY, OF HAMILTON, OHIO.

TOOL-RELIEF FOR METAL-PLANERS.

SPECIFICATION forming part of Letters Patent No. 713,614, dated November18, 1902.

Application filed February 13,1902. Serial No. 93,820- (No model.)

To wZZ whom, it may concern: mounted on the planer-bed; 18, a pincarried Be it known that I, ADOLPH L. DE LEEUW, by a dog adjustablealong the planer-bed and acitizen of the United States, residinginl-Iamadapted to strike and shift the switch-lever ilton, Butler county,Ohio, (post-office address as the table nears the completion of its cut-5 Hamilton, Ohio,) have invented certain new ting stroke; 19, a similardog-pin adapted to and useful Improvements in Tool-Beliefs for shift theswitch-lever as the table nears the Metal-Planers, of which thefollowing is a completion of its return stroke; 20, asegmenspecification. tal contact-piece adapted to be engaged byThisinvention,pertainingtoimprovements the switch-lever; 21, a secondcontact-piece IO intool-reliefsformetal-planers,will be readily adaptedto be engaged by the switch-lever understood from the followingdescription, while it is in engagement with contact-piece taken inconnection with the accompanying 20, but of lesser lengthwise extent, sothat drawings, in whichthe switchlever may continue to engage withFigure l is a side elevation of portions of contact-piece 20 afterpassing oif of contact- 15 an ordinary metal-planing machine providedpiece 21; 22, a contact-piece in prolongation with a tool-reliefexemplifying my presentinof but separate and insulated fromcontactvention; Fig. 2, a diagram illustrating electric piece 21,contact-piece 20 havingsuch extent circuits controlling the magneticrelieving oflength thatit may beengaged bytheswitchdevice; Fig. 3, afront elevation of the toollever when the latter is in engagement with20 box and its immediate attachments; Fig. 4C, a either of thecontactpieces 21 or 22; 23, an

vertical section of the same; and Fig. 5 a plan electric circuit leadingfrom a source of elecof the same, one of the magnet-spools appeartrioenergy, one of its members passing ing in horizontal section. throughthe coils of the electromagnet 11 and In the drawings, 1 indicates thebed of an orterminating at contact-piece 20,while its other 25 dinarymetal-planer, 2 the table, 3 the housmember goes to and terminates atcontactings, 4c the rail, 5 the saddle, 6 the swivel, piece 21; 24, anelectrical resistance device 7 the slide, 8 the tool-box, 9 thetool-clamps, typified by an electric lamp in a branch of 10 the apron,all the parts thus far referred that member of the circuit terminatingat to being of ordinary construction; 11, a pair contact-piece 21; 25,the circuit branch just 0 of electromagnet-spoolsmounted on the frontreferred to, the same going through resistface of the upper portion ofthe tool-box ance 24c and terminating at contact-piece 22, above thehinge of the apron, the axes of and 26 that member of the circuitterminatthe spools being parallel and projecting foring at contact-piece21. wardly from the tool-box in a common hori- Referring to Figs. 3, 1,and 5, when the 35 zontal plane parallel with the axis of the apron 10is home in the tool-box in cutting,

hinge-pivot of the apron; 12, an armature position the armature 12stands away from disposed across in front of the cores of the themagnet-poles, being suspended by the electromagnet and standing normallysome hangers 15 and the end of set-screw 16 being little distanceforward of the magnet-poles; in or nearly in contact with the face oflever- 4o 13, a lever-arm projecting rigidly upward arm 13. If theelectromagnet be sufficiently from the apron to the rear of the armatureenergized, then the armature will be drawn and between themagnet-spools; 14, a pair of toward it, resulting in the pushingrearward studs projecting rigidly forward from the face of lever-arm 13and the swinging forward of of the tool-box above the magnet-spools; 15,the lower portion of the apron and the con- 5 45 hangers projecting upfrom the armature and sequent elevation and reliefof the tool. Thishaving their upper ends pivoted in the foraction on the part of theelectromagnet is to ward ends of studs 14:, whereby the armature takeplace when the tool is to be lifted, the is pivotally suspended; 16,aset-screw through apron falling again and restoring the tool to thecentral portion of the armature, its inner cutting position when themagnet is den- 50 end being adapted to impinge against the forergized.The cores of the spools are shown 9 ward face of lever-arm 13; 17,aswitch-lever as threaded directly into the metal of the tool-box, whichlatter therefore forms the heel-bar of the magnet. The suspension deviceof the armature should be of non-magnetic metal, and the pole-faces ofthe magnet or armature should also be armed with nonmagnetic metal.

The switching of the current to and from the electromagnet is effectedby the dogs, adjustable along the planer-table, which dogs may be theones usually provided upon planet's, the intention being that the magnetis inert while the table is making its cutting stroke, the current goingto and energizing the magnet and lifting the tool just before thereversal of the table motion takes place, the tool being held inelevated position of re- .lief while the table is making its backingstroke and dropping again to cutting position by the de'energization ofthe magnet just before the table reverses at the beginning of thecutting stroke.

The armature normally stands at some distance from the pole-faces of themagnet, and the work of initiating the tipping of the apron and tool iscomparatively heavy, thus requiring such a strength of current as mightdamage the spools if maintained throughout the backing stroke of theplaner. The attractive power of the magnet becomes greater as thearmature approaches it, and when the armature shall have completed itsactive motion then the air-gap is practically ml and comparativelylittle current may sustain the apron and tool in tilted position. Itherefore arrange for a preliminary application of heavy current to theelectromagnet to do the work of lifting the tool, this being followed bya reduction of the current strength to a point sufficient to maintainthe tool in lifted position without danger to the electromagnet. Thismay be understood from Figs. 1 and 2, in which the switch-lever is inidle position, corresponding with the cutting stroke of the planer. Itwill be observed in Fig. 2 that the circuit is entirely open and thatconsequently the electromagnet 11 is inert. As the table nears thecompletion of its cutting stroke after the finish of the cut, but beforereversal, dog-pin 1S shifts the switch-lever to contact-pieces 20 and21, thus putting the full current through the electromagnet 11, underwhich conditions the magnet becomes powerfully energized, and the apronand tool become tilted to position of relief. The table continues itsbackward motion, and the switch-lever travels off of contact-pieces 21and onto contact-piece 22, thus leaving the circuit closed only throughthe resistance 24, the current thus reduced being sufficient to maintainthe tool in relief position. Under these conditions the table makes itsreversal and completes its backing stroke, the switch lever remaining oncontact-pieces 20 and 22. As the table nears the. end of its backingstroke then dog-pin 19 shifts the switch-lever first oif ofcontact-piece 22 onto contact-piece 21 and finally out of all contact,under which condition the circuit is opened, the magnet deenergized, thetool allowed to fall to cutting position, and the table makes itsreversal and performs its cutting stroke, and so on and on. It will beapprehended that when the table completes its backing stroke and theswitch-lever is being thrown from light-duty position on contact-piece22 to idle position of open circuit it passes over high-dutycontact-piece 21, thus putting again to the electromagnet the fullstrength of the current. This incidental momentary application of thefull current strength, while of no benefit, does no harm.

I claim as my invention 1. In a tool-relief for metal-planers,thecombination, substantially as set forth, of a toolcarrying part mountedfor motion in a direction to effect the relief of the tool away from thesurface being planed, an electromagnet, an armature having connectionwith said tool-carrying part, an electric circuit connected with saidelectromagnet, a branch from said circuit through an artificialresistance, a switch adapted to open said circuit and to close it eitherthrough said electromagnet direct or through said electromagnet andartificial resistance, and adjustable dogs arranged to move in unisonwith the planer-table and serving to actuate said switch.

2. In a tool-relief for metal-planers,the combination, substantially asset forth, of a toolbox, an apron hinged therein, a 1ever-arm projectingfrom the apron, an electromagnet mounted on'the tool-box, an armaturecooperating with said electromagnet and engaging said lever-arm, anelectric circuit for energizing the electromagnet, a switch forcontrolling said circuit, and dogs arranged to move in unison with theplaner table and serving to actuate said switch.

8. In a tool-relief for metal-planet's, the combination, substantiallyas set forth, of a toolbox, an apron hinged therein, a lever-armprojecting from the apron, an electromagnet mounted on the tool-box, apivotally-supported armature cooperating with said electromagnet andengaging said lever-arm, an electric circuit for energizing theelectromagnet, a switch for controlling said circuit, and dogs arrangedto move in unison with the planet'- table and serving to. actuate saidswitch.

4. In a tool-relief for metal-planet's, the combination, substantiallyas set forth, of a toolbox, an apron hinged therein, a lever-armprojecting upwardly from the apron, a pair of magnet-spools projectingfrom the face of the tool-box and straddling said lever-arm, an armaturedisposed in front of said magnetspools and engaging said lever-arm, anelectric circuit for energizing said spools, a switch for the control ofsaid circuit, and dogs to actuate the switch.

ADOLPH L. DE LEEUW.

Witnesses:

J. W. SEE, E. R. SHIPLEY.

TIC

